Abstract: A waste extraction system (10) for an aquaculture tank (12) includes a first conduit (18) having a first end (20) and a distant second end, with a second conduit (22) disposed within the conduit (18). The second conduit (22) has a first end (24) which is co-terminus with the end (20) of the first conduit (18). A plate (26) extends transversely across the ends (20, 24) and laterally of the first conduit (18). An axial hole (28) is formed in the plate (26) to provide fluid communication with the second conduit (22), but the plate (26) otherwise closes off or seals the end (20) of the first conduit (18). Legs (30) are formed on an underside of the plate (26) to space the plate (26) from a bottom wall (16) of the tank (12). Apertures (34) are formed in the conduit (18) near its first end (20) to allow water to flow into a flow chamber (36) created between an inner surface of the conduit (18) and an outer surface of the conduit (22).

Abstract: A filter canister including a frame; a sheet of flexible fabric material that allows the flow of water therethrough, the sheet of flexible fabric material being connected to the frame in a manner defining an internal zone whereby substantially all fluid entering the internal zone from an opposite side of the sheet of flexible fabric material passes therethrough; and a conduit having a first end located externally of the frame and a second end located within the internal zone defined by the sheet of flexible fabric material; wherein, upon connection of the first end of the conduit to a fluid intake system, fluid is drawn through the sheet of flexible fabric material into the internal zone, thereby filtering the fluid, and filtered fluid is drawn through the second end of the conduit for delivery into the fluid intake system. A system and method for filtering fluid intake water are disclosed.

Abstract: The present invention is a floatation process and associated apparatus for removing heavy metal waste from various effluent water streams. The process and apparatus generally introduces a population of fine diameter air bubbles and one or more flocculating chemicals into an effluent stream to produce buoyant floc structures that include the heavy metals and that can be removed from the effluent stream. The present invention provides a reliable, cost-effective means of removing heavy metals from effluent water streams.

Abstract: A water treatment equipment has a raw water tank as a mixing section, a micronanobubble generation tank, a floatation tank, and a treated water tank. Waste water as treatment water is introduced into the raw water tank and mixed with the water containing micronanobubbles produced by the micronanobubble generation tank. Thereafter, the waste water, as treatment water, is introduced into a lower mixing section of the floatation tank from the raw tank by a raw water tank pump. Also, treatment water containing fine bubbles is introduced into the lower mixing section from a pressure tank. Therefore, the micronanobubbles is mixed with the fine bubbles in the lower mixing section of the floatation tank, thereby almost all the suspended matter in the treatment water is surfaced. Thus, the water treatment equipment enhances separatability of suspended matter.

Abstract: A method and an apparatus for wastewater treatment using a nitrogen/phosphorus removal process combined with a floatation separation of sludge that is replaced by the gravity settling secondary clarifier are provided for effectively removing organic substances, nitrogen, phosphorus, granular substances and the like from wastewater. Al or Fe electrode plate is used for generating the micro bubbles so that phosphorus is removed by Al or Fe ions dissolved from the anode.

Abstract: An automatic lifting level controller for the discharge of foam is mainly to install a foam collection port, a foam discharge port and foam guide channel on a body, which has a floating chamber that moves up and down according to the water levels. It is installed in a protein skimmer to reinforce the functionality and practicability of the protein skimmer by sucking and discharging the foams fractionated by the protein skimmer from the seawater or fresh water.

Abstract: The coupling of a sewer treatment station to a treatment plant for the flocculation and flotation of water streams and the insertion of said treatment plant for the flocculation and flotation of water streams into a water treatment station. The sewer treatment station is installed upstream from the flocculation and flotation treatment station, in such a way that the outlet of said station is directly connected to the inlet of the flocculation and flotation treatment plant disposed next to the stream bed or next to and interconnected thereto by means of a varying flow canal. The insertion has dynamic introduction of the process of treatment for the flocculation and flotation of fluid beds, all in a closed canal, wherein the flow of secondary streams (E) is dynamically and continuously submitted to flocculation and flotation techniques in an induced flow canal (FE) in the water treatment station.

Abstract: A sludge treatment method allowing an improvement in a phosphorus recovery rate and sludge volume reduction by efficiently eluting phosphorus in the sludge. The sludge treatment method includes: a step of foaming a sludge-containing liquid by blowing an ozone-containing gas into the sludge-containing liquid; and a step of eluting phosphorus in the sludge-containing liquid by bringing sludge adsorbed on bubbles and a sludge-dissolving agent into contact with each other. The sludge treatment method may further include the steps of: separating the phosphorus eluted sludge-containing liquid into a phosphorus eluate and a residual sludge; and precipitating a phosphorus compound by adding a coagulant to the separated phosphorus eluate.

Abstract: Semi-submersible floating decanters and methods of use are provided. The decanters are moveable between a non-decant position and a decant position, and include a float forming an internal cavity, the float having a central annulus, a weir having an inlet opening and positioned within the center of the annulus and fixedly connected to the float forming a passage between the float and the weir, and a discharge conduit connected to the weir for discharging a supernatant fluid therefrom. A depth adjusting mechanism is provided for moving the decanter within a liquid between a non-decant position wherein the inlet opening is above the surface of the liquid and a decant position wherein the inlet opening is positioned within the supernatant to allow the supernatant to be withdrawn, the depth adjusting mechanism including a pumping mechanism for moving a fluid relative to the internal cavity.

Abstract: The present invention discloses an anaerobic biological wastewater treatment system for treating wastewater containing organic contaminants, which includes an anaerobic sludge bed reactor and a dissolved-air flotation tank. The anaerobic sludge bed reactor is used to decompose organic contaminants by way of an anaerobic biological treatment. The dissolved-air flotation tank is used to carry out liquid-solid separation on effluent from the anaerobic sludge bed reactor, so that anaerobic microorganisms entrained in the effluent can be recovered and recycled to the anaerobic sludge bed reactor, thereby enhancing the hydraulic loading of the anaerobic sludge bed reactor.

Abstract: According to the present invention, there is provided a wastewater processing apparatus and method comprising a rotating filter thickener (20) receiving and filtering a wastewater mixture and producing a first filtrate output and a first sludge output, a screw press thickener (24) receiving the first sludge output and forming a final sludge output and a second filtrate output, a dissolved air floatator (46) receiving the first filtrate output from the rotating filter thickener (20) and producing a first solid output and a third filtrate output.

Abstract: A method and apparatus for aerating a surface layer in a stratified liquid body using a depth-adjustable, fine bubble, surface layer aeration unit comprising: a body comprising at least one hollow internal structure; an air inlet communicating with the at least one hollow internal structure, whereby air from an external air source may be introduced into the at least one hollow internal structure; at least one fine bubble aerator communicating with the at least one hollow internal structure, whereby air from the at least one hollow internal structure may be released through the fine bubble aerator into an adjacent fluid; and at least one weight pod attached to the body, wherein the at least one weight pod comprises structure for adjusting the weight of the at least one weight pod, whereby the buoyancy of the aeration unit may be adjusted so as to permit the at least one fine bubble aerator to be positioned at a desired depth in a fluid body.

Abstract: Biological nutrient removal (BNR) in municipal wastewater treatment to remove carbonaceous substrates, nutrients and phosphorus, has recently become increasingly popular worldwide due to increasingly stringent regulations. Biological fluidized bed (BFB) technology, which could be potentially used for BNR processes, can provide some advantages such as high efficiency and compact structure. This present invention incorporates the fixed-film biological fluidized bed technology with the biological nutrient removal in a liquid-solid circulating fluidized bed, which has achieved the simultaneous elimination of organic carbon, nitrogen and phosphorus, in a very efficient manner and with very compact space requirements.

Abstract: This application relates to a circular clarifier for separating and removing separable matter, such as suspended solids, from a liquid. The invention may be used, for example, for separating return activated sludge from clarified liquor using a gas flotation process. The clarifier includes a plurality of fluid feed ports for introducing influent into selected treatment cells of the clarifier in a timed sequence, thereby achieving batch flotation of solids or other separable matter in a continuous infeed process. A plurality of spaced-apart, rotating flocculent handling assemblies traverse the treatment cells for sequentially conveying flocculent into spaced-apart, radially extending collection troughs. All of the flocculent handling assemblies may be driven by a single drive means. Each flocculent handling assembly includes a submerged beach and a scraper assembly including a scraper blade which extends upwardly from the beach. The beaches provide a shear plane underneath the surface layer of flocculent.

Abstract: Apparatus and methods for dissolving a gas into a liquid comprises a saturation tank, a high pressure liquid pump in fluid communication with the tank, and a pressurized gas source in communication with a regulated gas head space of the saturation tank. The saturation tank comprises a pressure vessel for containing the liquid and has a regulated gas head space above the liquid, contains at least one liquid spray nozzle that permits passage of liquid into the pressure vessel, and an outlet for the liquid containing dissolved gas. Upon passing the gas-containing liquid into a second fluid, the gas is released in the form of microbubbles. The microbubbles aid in flocculation of suspended particles and promote dissolution of the gas in the second fluid. Preferred gases for use with the apparatus are oxygen, air, and ozone. Anticipated uses include treatment of rivers, streams, and ponds in natural or industrial settings, as well as smaller scale applications.

Abstract: Mixing apparatus is disclosed suitable for the mixing and/or aeration of large bodies of water e.g. lakes or reservoirs. One particular use is in causing controlled destratification. Another area of use is in the aeration or oxygenation of liquid waste. The mixing apparatus has a draft tube (1) with an open interior, and gas injectors (6) to drive an upward flow of liquid through the draft tube (1). An arrangement of angled vanes (4) at the intake of the draft tube imposes swirl on the flow, which then rises unobstructed through the draft tube (1). No moving parts are involved.

Abstract: An apparatus for processing an alkaline solution includes a storage tank storing the alkaline solution to be processed; a processing unit sucking a foam phase disposed on the liquid surface level of the alkaline solution in the storage tank, defoaming the foam phase by centrifugal separation, and extracting the foam phase outside the storage tank, the processing unit including an extraction tube; a separating tank separating scum and a liquid, the separating tank being connected to the extraction tube; a scum-discharging component discharging the scum in the separating tank outside the separating tank; and a liquid-discharging component discharging the liquid in the separating tank outside the separating tank. In the apparatus, the scum and the liquid separated in the separating tank are separately discharged outside the separating tank with the scum-discharging component and the liquid-discharging component, respectively.

Abstract: A method is disclosed for clarifying, by flotation, waters contaminated with suspended matter, wherein the clarification treatment takes place in two successive steps implemented in a single installation. The method principally involves flowing contaminated water through a downflow static flocculation step and then down through a lamellar settler separation step positioned directly below the downflow static flocculation step, the settling rates of the heavier particles of the lamellar settler separation step removing heavier particles from the water retained during the static flocculation/lamellar separation step being less than or equal to the settling rates of the floatable particles. The water which has passed through the static flocculation/lamellar settler separation step is then subjected to a flotation step which removes the light particles in the water of which the settling rate is lower than a flotation cutoff threshold.

Abstract: A multifunctional filtering device for an aquarium mainly includes a filter box for being suspended at an aquarium. The filter box includes a pump motor for producing mixture of water and air and a vortex flow generator disposed at the center of the inner side of the bottom thereof and in communication with a water outlet disposed at the pump motor. A bubble collector is disposed at the top of the vortex flow generator. The filter box may be suspended inside or outside the aquarium. The filter box includes a water input pipe unit and a water output pipe unit which may be differently configured in accordance with the suspension position of the filter box. The water output pipe unit may be further disposed with a heating rod or ultraviolet sterilization lamp for heating or sterilizing breeding water in the aquarium.

Abstract: A water purification installation includes a coagulation area, a flocculation area, an area for mixing, in an upflow, the flocculated water with pressurised water which is delivered by a microbubble-generating pressurisation-pressure reduction system, and a flotation area. Suspended matter, which is brought to the surface by the microbubbles, is evacuated from the upper part of the flotation area. Moreover, the lower part of said flotation area includes means of collecting the clarified water. The geometry of the flotation area is such that the ratio between the height (H) of the area located above the clarified water collection means and the length (L) of the area is between 0.3 and 1; and the ratio between the surface (Sa) of the nappe at the outlet of the mixing area and the surface (Sp) of the actual flotation area is between 0.05 and 0.5 and, preferably, between 0.1 and 0.35.

Abstract: A fluid treatment system and method for dissolving a gas into a fluid and subsequently allowing microbial or chemical reactions with the fluid mixture to decontaminate the fluid. The system comprises a pressurized gas transfer reactor, a depressurization device, a means of rapid dilution, a reactor, and a means of secondary clarification. Gas is dissolved into a fluid within the pressurized gas transfer reactor. The fluid is then transferred to the depressurization device where it is depressurized and diluted. Thereafter, or concurrently, the fluid flows into the reactor where microbes consume contaminants and dissolved gas within the fluid. The decontaminated fluid then either flows into a secondary clarification tank or membrane system where the bacteria within the decontaminated fluid are removed, or the fluid is recycled through the system. The method of present invention utilizes the system of present invention and operates pumps and a regenerative turbine or throttling valve.

Abstract: Free oil, fat and grease contaminate water and wastewater these contaminants can be removed by an efficient separator system and allow the contaminants to be recovered at their maximum concentration.

Abstract: A combined degassing and flotation tank for separation of a water influent containing considerable amounts of oil and gas. A rotational flow is created in the tank which forces the lighter components such as oil and gas droplets towards an inner concentric cylindrical wall where they coalesce and rise to the surface of the liquid and are removed via the outlet (3) whereas the heavier parts are forced down where the heavy particles sink to the lower part where they may be removed as a sludge. The water is discharged via an outlet in the lower part of the tank. The combined degassing and flotation tank is particular suited for use in oil production at sea for removal of oil and gasses from water streams before the water is returned to the sea.

Abstract: The invention relates to a centrifugal separating device and method for clarifying must during wine production, especially with a separator (7). Gas and/or gelatine and/or other additives are added to the must that is clarified in the separating device after the must has passed through the separating device and before it passes through the constant pressure valve (13) of the separating device, as the must is discharged (9), in order to obtain flotation.

Abstract: One embodiment of an aerator is disclosed that has a hollow intake housing with a horizontally disposed lip on a lower portion thereof. This intake housing converges a flow of bubbles into a draft tube. These bubbles are injected into a fluid in which the aerator is installed at a location that is directly under the intake housing. A fluid flow is also drawn into this draft tube through the intake housing. Fluid exiting the opposite end of the draft tube is directed into a hollow discharge housing having a divergent inner surface. A wave generator (e.g., a rotating impeller) is mounted within the hollow interior of the discharge housing. The upper end of this discharge housing also includes a horizontally disposed lip to direct a flow out of the aerator at least generally parallel with an upper surface of the fluid.

Abstract: The present invention includes a horizontal foam fractionation protein skimmer for removing organic waste material (dissolved organic compounds) from organic loaded water. The protein skimmer includes a horizontal reaction chamber connected to a foam collection chamber in which protein-loaded foam containing organic waste material is collected. The reaction chamber is comprised of a series of horizontally-directed, nested, concentric tubes for increasing the number and decreasing the size of bubbles to facilitate efficient removal of dissolved organic compounds. Each horizontal tube has either one or several small openings that are offset from the openings on the adjacent tube at a small angle, typically 10°. The openings are formed by either a single slit that runs along the length of each tube, or by a series of holes that runs along the length of each tube. Organic-loaded water is pumped through tubing into the reaction chamber. As water moves through the tubing, gas (e.g.

Abstract: A method which uses a process reactor having three separate reaction stages to remove high concentrations of heavy metals from acidic wastewater and chemical solutions. During each of three stages the pH level of the wastewater is increased and sludge and flocculate organic and metal hydrocyl matters are removed from the wastewater to provide clean water which is discharged in to a sewer system.

Abstract: The device includes a tubular body, superiorly closed by a cover, having a truncoconical transversal section and a vertical lie, internally of which a separator wall is housed, for collecting liquid, having an inlet mouth and a drainage channel. The device includes a rotating organ for separating polluting substances, which rotating organ is closed internally of elements for collecting and percolating the polluting substances.

Abstract: An apparatus having various conduits moves liquid by passing gas up through it. A collector conduit transports the liquid to the bottom of the unit. A gas-lift conduit mixes the liquid and gas at the bottom and transports the mixture upwards, owing to the rising action of the bubbles and the resulting decreased density of the gas/liquid mixture. At the top of the gas-lift conduit, some of the gas may escape from the liquid and out of the apparatus. The lifted liquid may exit the apparatus at an elevation higher than the entry point of the liquid or may be directed down through a down and out conduit. A one way valve or equivalent configuration may be used to limit flow to one direction.

Abstract: According to the present invention, there is provided a wastewater processing apparatus and method comprising a rotating filter thickener (20) receiving and filtering a wastewater mixture and producing a first filtrate output and a first sludge output, a screw press thickener (24) receiving the first sludge output and forming a final sludge output and a second filtrate output, a dissolved air flotator (46) receiving the first filtrate output from the rotating filter thickener (20) and producing a first solid output and a third filtrate output, a first conductor (10, 12, 29) for mixing incoming raw manure wastewater and the second filtrate output from the screw press thickener (24) to produce the wastewater mixture for input to the rotating filter thickener (20), and a second conductor (34) for branching off a part of the first filtrate output to a spray cleaner (38) for spraying the part of the first filtrate output onto the filtration disks (70) for their cleaning.

Abstract: A process and a means are described for treatment of water that forms a growth environment for marine organisms, where this water is in a main tank that is placed on land. The invention provides a sufficient treatment/cleaning of the water so that it can be continuously re-circulated, and thus form a closed loop where one is not dependent on supply of external water.

Abstract: An apparatus which uses a process reactor having three separate reaction stages to remove high concentrations of 3000 mg/l heavy metals from acidic wastewater and chemical solutions. During each of three stages the pH level of the wastewater is increased and sludge and flocculate organic and metal hydroxyl matters are removed from the wastewater to provide clean water which is discharged in to a sewer system.

Abstract: The invention relates to apparatus for treating water by skimming, the apparatus comprising: a reaction chamber (8); injector means (4) for delivering the water for treatment via an injection orifice into the reaction chamber; means (20) for forming microbubbles of gas in the water to be treated; and condensation means (10) for collecting the resulting foam, the apparatus being characterized by the fact that the microbubbles are injected into the reaction chamber (8) together with the water for treatment. The invention also provides a method of treating water by skimming, in which: the water for treatment is injected into a reaction chamber (8); microbubbles of gas are formed in the water for treatment; and the foam that is produced is separated from the water for treatment, the method being characterized by the fact that the microbubbles are injected into the reaction chamber (8) together with the water for treatment.

Abstract: A dissolved air flotation system and method for purifying fresh water. The system is self-contained within a standard shipping container, with all components disposed in-line within the shipping container. Float is removed from the flotation tank with a skimmer that drives float downstream onto a conveyor belt, and the conveyor belt conveys float away from the flotation tank, in the downstream direction, and deposits the float in a collection tank. Clean water may be drawn from the flotation tank continuously, while float may be removed periodically.

Abstract: A reactor has an aerobic tank, an anoxic tank and a sealed membrane tank with conduits for circulating mixed liquor between them. Permeation starts when the mixed liquor reaches a high level and stops when the mixed liquor reaches a low level. A sensor, for detecting the mixed liquor level, may stop and start permeation. Pressure builds in the membrane tank when membrane air is on. Transmembrane pressure is also provided by gravity flow or siphon. Membrane air generates an air lift which drives the mixed liquor circulation. The total amount of air provided by an air source is divided and varied in time between the membrane aerator and the process aerator. The process aerator acts as a screening inlet to the conduit to the membrane tank. Chemical maintenance cleaning is provided by gravity flow.

Abstract: A multifunctional filtering device for an aquarium mainly includes a filter box for being suspended at an aquarium. The filter box includes a pump motor for producing mixture of water and air and a vortex flow generator disposed at the center of the inner side of the bottom thereof and in communication with a water outlet disposed at the pump motor. A bubble collector is disposed at the top of the vortex flow generator. The filter box may be suspended inside or outside the aquarium. The filter box includes a water input pipe unit and a water output pipe unit which may be differently configured in accordance with the suspension position of the filter box. The water output pipe unit may be further disposed with a heating rod or ultraviolet sterilization lamp for heating or sterilizing breeding water in the aquarium.

Abstract: A wastewater separator to separate waste from a mixed wastewater stream including one or more of heavy waste, light waste and water. The wastewater separator comprises a separation container, a inlet and an outlet. The separation container comprises (1) a wastewater stream director within the separation container, the wastewater stream director being sized, shaped and positioned relative to the wastewater inlet to direct the wastewater stream along a preferred flow path to permit the light waste to separate from the wastewater stream in a first direction to a collection area and to permit the heavy waste to separate from the wastewater stream in a second direction towards a heavy waste removal area; and (2) a flow-directing outlet baffle within the separation container for directing the wastewater stream to the wastewater outlet from the heavy waste removal area to remove the heavy waste from the separation container.

Abstract: A gas/liquid pump moves liquid by passing gas up through it. Pumping is accomplished by the liquid's moving through three conduits. The first, a collector conduit, transports the liquid to the bottom of the unit. The second, a gas-lift conduit, mixes the liquid and gas at the bottom and transports the mixture upwards, owing to the rising action of the bubbles and the resulting decreased density of the gas/liquid mixture. At the top of the gas-lift conduit, some of the gas escapes from the liquid and out of the unit. The lifted liquid then returns to near its original density and exits the unit through the down and out conduit.

Abstract: Apparatus and process for aerating a liquid with gas, the apparatus comprising a pressure vessel including a lower section containing the liquid and an upper section containing a volume of the gas. A pressure connection in the upper section of the pressure vessel adapted receives the gas. A nozzle in the upper section of the pressure vessel receives the liquid. An injector extends from the upper section of the pressure vessel to the lower section of the pressure vessel and has a head in fluid communication with the nozzle. Part of the gas volume is sucked in by the vacuum generated by the liquid injected, carried along together with the liquid and mixed intimately with the liquid at the same time.

Abstract: A paint spray booth sludge recovery system, apparatus and method is provided for water washed paint spray booths. The spray booths are used with a tank or pit which can accommodate flotation for removal of spent paint. Preferably, the tank has a drop box section, a chemical treatment section, a weir box section and a booth recirculation pump section. A series of weirs are used to separate the spent paint and send a concentration thereof from the weir box to a separator or centrifuge. The water level in the system is controlled by sensing the weir box water level to keep the water crests over the weirs at the desired levels. Scavenging and agitation are provided in the tank to keep it entirely clean for prolonged periods without any accumulation, even during downtime.

Abstract: A column of solvent containing foaming contaminants is provided. Gas is educted into the solvent in the column so as to generate foam in the column. The gas is educted into the column independently of the input flow of solvent into the solvent using a pumparound arrangement with the solvent. Foam generation continues so as to push the foam up in the column, wherein much of the solvent that is in the foam is allowed to drain back down into the column. The foam passes through concentrators which increase the residency time of the foam in the column to further dry the foam and to create larger bubbles. The drier foam is pushed out of the column and into a container. The foam is broken up into gas and the liquid foaming contaminants. The gas is recirculated for injection into the column even after foaming has stopped. The foaming contaminants are concentrated at the surface level of the solvent in the column. These contaminants are removed from the column.

Abstract: A system for separating particles from a contaminated liquid stream includes an apparatus for mixing the liquid with one or more separation enhancement additives and gases. A pressure reducing device having a flow restrictor element within an enlarged tube receives the mixed liquid and creates bubble laden floccs by reducing the pressure of the liquid stream. The pressure reducing device empties into a bloom chamber of a flotation tank, where the bubble laden floccs are directed upwardly to an upper portion of the flotation tank. The flotation tank is configured such that the bubble laden floccs circulate within the upper portion of the flotation tank until they float to the upper surface, while decontaminated liquid flows to a lower portion of the tank for removal. A skimmer removes the floated contaminated floccs from the upper surface of the flotation tank into a dewatering apparatus.

Abstract: A method and apparatus for supplying dissolved gases (such as oxygen, ozone, chlorine etc.) for chemical and biological processes is described. The methods and apparatus described are particularly suitable for use in the biodegradation of organic matter (such as in municipal and industrial wastewater treatment), and other uses. The apparatus may comprise a dissolved gas supply system.

Abstract: The present invention relates to methods and apparatus for separation of solids from liquids and separation of liquids from liquids (such as oil from water) by dissolved gas floatation. A dissolved gas floatation clarifier is described as is a liquid-gas mixer, a liquid-liquid mixer, and solid-liquid chemical feeders. The methods and apparatus of the present invention are particularly suitable for supplying dissolved air and mixing of chemicals for use in separation of solids in dissolved air floatation clarifiers.

Abstract: A digester is provided for aerobically and microbially digesting a batch of bodily waste material, such as an aqueous slurry of pig manure. The digester comprises side-by-side digestion and separation compartments, separated by a partition wall. A first slanted pipe extends through the wall and has its inlet at the lower end of the separation compartment. Pressurized air is injected into the inlet so that slurry from the separation compartment is drawn into the bore of the first pipe, is mixed and aerated therein and is ejected into the slurry in the digestion compartment as a powerful jet. The jet establishes a vertical circulation in the digestion compartment. Slurry, containing undigestible solids, drains through a second pipe from the central core of the circular flow into the separation compartment. Here the aerated non-digestible solids tend to float and can be removed.

Abstract: It has been discovered that a mechanical flotation system having only two cells can be nearly as efficient as one having more cells, yet provide an apparatus with a considerably smaller footprint, significantly reduced capital and operating costs, as well as be resistant to floating oil recovery platform wave effects. The dual-cell mechanical flotation system has, in sequential order, an inlet chamber and two gasification chambers or cells, each with at least one gas ingestion and mixing mechanism, and a discharge chamber. A common primary skim collection channel atop the partition dividing the gasification chambers efficiently channels away the bulk of the floating collected matter. At least one baffle depending from the top of the vessel near the primary skim collection channel helps dampen the action of the fluid containing the suspended matter when the vessel is affected by wave motion against the floating oil production platform.

Abstract: A method for removing contaminants from a liquid includes filtering objects of a relatively large dimension. The liquid is then mixed with additives to adjust the chemistry of the liquid. The liquid is pressurized and directed through a gasification device to dissolve gas into the liquid. This is accomplished by directing the liquid into an inlet of a hydrocyclone of the gasification device, directing the liquid exiting the hydrocyclone upwards to remove large bubbles, and removing liquid containing dissolved gas from a bottom portion of a vessel of the gasification device. The pressure of the liquid is then reduced and the liquid is introduced into a separation tank, and the contaminants are removed from the liquid by stratification. The treated water is removed from the separation tank, and sludge formed by skimming flocs from a liquid surface of the tank is subjected to a dewatering process.

Abstract: A dissolved air flotation system and method for purifying fresh water. The system is self-contained within a standard shipping container, with all components disposed in-line within the shipping container. Float is removed from the flotation tank with a skimmer that drives float downstream onto a conveyor belt, and the conveyor belt conveys float away from the flotation tank, in the downstream direction, and deposits the float in a collection tank. Clean water may be drawn from the flotation tank continuously, while float may be removed periodically.

Abstract: The invention relates to a device for separating solids from liquids by means of flotation, particularly for separating impurities and ink particles from fibre suspensions, with several injectors 10, which are provided inside a flotation cell 1. It is mainly characterised by the injectors 10 being arranged in one row.

Abstract: A method for decontaminating soil containing inorganic contaminants having a degree of liberation of at least 60%, comprising the steps of removing from a coarse fraction at least a portion of inorganic contaminants in particulate form contained therein with a jig to produce a treated coarse fraction, removing from an intermediate fraction at least a portion of inorganic contaminants in particulate form contained therein with a separator selected from the group consisting of a spiral and a classifier to produce a treated intermediate fraction, removing from a fine fraction at least a portion of inorganic contaminants in particulate form contained therein with a separator selected from the group consisting of a flotation cell and a multi-gravity separator to produce a treated fine fraction, whereby the combined treated coarse, intermediate and fine fractions are impoverished in inorganic contaminants.